The application of two standards of morality, usually one for the social group which sets the standards and another for those outside the group, encourages exploitation of other social groups and violence or otherwise immoral conduct against them. This may include racism, religious intolerance, sexual exploitation of women, and discrimination.
In his novel 1984, Orwell introduced the term doublethink, which he describes as follows: Doublethink means the power of holding two contradictory beliefs in one’s mind simultaneously, and accepting both of them . . To forget any fact that has become inconvenient, and then, when it becomes necessary again, to draw it back from oblivion for just so long as it is needed . . . all this is indispensably necessary.